S
M
T
W
T
F
S
26
86°
67°
27
90°
69°
28
82°
64°
29
67°
58°
30
68°
55°
1
68°
54°
2
76°
47°
3
83°
49°
4
80°
55°
5
84°
57°
6
58°
54°
7
77°
53°
8
81°
54°
9
90°
65°
10
75°
61°
11
77°
59°
12
82°
52°
13
87°
64°
14
90°
67°
15
87°
68°
16
90°
71°
17
92°
71°
18
88°
70°
19
79°
65°
20
77°
65°
21
82°
64°
22
81°
63°
23
80°
61°
24
84°
65°
25
84°
66°
26
83°
63°
27
86°
68°
28
85°
67°
29
84°
68°
30
80°
68°
31
82°
67°
1
80°
68°
2
83°
68°
3
86°
69°
4
87°
69°
5
87°
68°
6
82°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Eureka
Eureka's May 2026 forecast shows daily high temperatures ranging from 77° to 92°, with overnight lows between 61° and 71°. The average high for May is 84° with an average low of 67°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Eureka. See also: June | July | August.
